You may be the most successful football coach in recorded history, the manager of one of the world’s top teams for more than 20 years, and have achieved knighthood. You may have fostered players like Paul Scholes, David Beckham and the Neville brothers. You may also be the only person in the world who’s able to take a piss at Roy Keane with one of your notorious “blow dryer” tell-offs and get away with it alive.